| World_Database_of_Crystallographers The IUCr free searchable online Directory of crystallographers and of other scientists employing crystallographic methods. Some functions require an IUCr password. |
| Bird_Skull_Collection Images and data about skulls of western Palearctic and Tropical species, with complete skeletons of some species. |
| Birdnet Ornithological Council's website with comprehensive data about North American ornithological resources. |
| Electronic_Resources_on_Ornithology Annotated links and ornithological articles by Christopher Majka. |
| Ornithological_Web_Library A comprehensive annotated library of over 1,800 ornithological and birding related links. |
| Ornithology__Science_of_Birds Includes data on the science of wild birds, with an emphases on conservation and education. |
| Smithsonian_Migratory_Bird_Center Ecological and land-management research, education, conservation policy, data on migration and fact sheets. |
| Classical_Logic Introduction to classical logic, including completeness and Löwenheim-Skolem theorems; by Stewart Shapiro. |
| Computability_Logic_Homepage Main online source on computability logic - a recently emerged formal theory of computational tasks and resources. Maintained by G.Japaridze. |
| Introduction_to_Mathematical_Logic Hyper-textbook for students by V. Detlovs and K. Podnieks. |
| Logic Open Encyclopedia entry. Hierarchically organized by subareas. |
| Logic Wikipedia article. |
| Math_Front__LO_Logic Front end for the logic section of the mathematics e-print arXiv. |
| Mathematical_Logic_and_Foundations From The Mathematical Atlas, a resource of mathematics maintained by David Rusin. Extensive resources related to logic and set theory. |
| Mathematical_Logic_around_the_World A rich collection of links to logic-related websites. |
| Mind_Versus_Goedel_by_Damjan_Bojadziev Compares the mind to advanced computers and artificial intelligence, as Goedel would possibly view them. |
| Aquifer_Test_Forum Information relating to the design, performance and evaluation of aquifer tests, including pumping tests, slug tests and single-well tests |
| CMI_Aquifers_Group Describes research on the behavior of carbon dioxide in hydrogeologic systems, aimed at developing systems for storing carbon in saline aquifers. |
| Distributed_Aquifer_Recharge_Enhancements_in_Arid_Zones Paper describes a modeling study to explore possible options for enhancing natural recharge. |
| Elango\'s_Home_Page Faculty member of Anna University, Chennai, India describes research and teaching in hydrogeology, groundwater modeling and hydrogeochemistry. |
| Environment_Canada__Groundwater A thorough introduction to the topic of ground water and its management. Part of Environment Canada's "Fresh Water" web site. |
| Fayette_County_Groundwater_Conservation_District Mission is to protect and conserve the underground water resources for the current and future residents of Fayette County, Texas. Offers publications, information on projects and services as well as g |
| George_F__Pinder Professor of Civil and Environmental Engineering, University of Vermont. Information about past and present research in groundwater modeling, including mathematical evaluation of contamination problem |
| Ground_Water_Modelling_Discussion_Group A forum for technical discussions; announcement of new software; calls for abstracts and papers; conference and workshop announcements; and summaries of research results, recent publications, and cas |
| The_Groundwater_Foundation Dedicated to the education about and preservation of our most important natural resource. |
| Groundwater_Geochemistry_and_Remediation,_University_of_Waterloo Summaries of research activities on the fate, transport and remediation of dissolved metals, metalloids and nutrients in groundwater, as well as development and application of in situ permeable reacti |
| Groundwater_in_British_Columbia B.C. ministry site, with general ground water information, water well data, information on groundwater consultants, and links. |
| Groundwater_Tracing_Unit,_University_College_London British research group. Describes current activities and capabilities in the use of tracers in hydrogeology, provides background on this technology and it history, lists consultancy capabilities, and |
| Henry_Darcy_and_His_Law About Henri Darcy and his contributions to understanding flow in porous media. Includes biography, discussions of basic concepts and the Darcy-Weisbach equation, and a lab procedure for falling-head p |
| The_Hydrogeologist\'s_Home_Page Collection of hundreds of links to hydrogeological organizations, software and data repositories, publications, and other resources. |
| Hydrogeology_Research_Group,_University_of_Tennessee,_Knoxville Conducts research on contaminant transport in groundwater and age-dating of groundwater. |
| King_County_(Washington)_Groundwater_Management Generic and local information on the occurrence, movement, and management of ground water. |
| National_Centre_for_Groundwater_Management,_UTS_(Sydney,_Australia) Consultancy and training in groundwater and environmental applications. Information about courses, distance learning (including online), research and consultancy interests, and links. |
| Organic_Compounds_in_Near_Surface_Environments Describes USGS studies of organic contaminants in groundwater, including landfill leachate and petroleum spills. Focus is on biological and chemical processes that control contaminant fate. |
| PEST_Parameter_Estimation_Groundwater_Modeling_Workshop The Groundwater Resources Association is conducting a workshop "Model Calibration and Predictive Uncertainty Analysis Using PEST" April 19-21, 2004, Santa Ana, CA |
| Publications_of_C__P__Kumar Technical papers of Mr. C. P. Kumar, Scientist, National Institute of Hydrology, Roorkee - 247667 (Uttaranchal), India. |
| SaltNet__Saltwater_Intrusion_Resources_Network Bibliography, computer codes, directory of researchers, and other information resources related to salt water intrusion into coastal groundwater aquifers. |
| UK_Groundwater_Forum Source of information and a platform for information exchange on groundwater topics in and for the UK. |
| The_University_of_Arizona_Contaminant_Transport_Group Publications lists and other information from the Brusseau research group, which investigates the fate and transport of contaminants in the subsurface. |
| University_of_Birmingham_School_of_Geography,_Earth_&_Environmental_Sciences Hydrogeology research including groundwater resources, numerical modelling, geochemistry, g/w contamination and remediation. Taught programmes include hydrogeology and hydroinformatics MSc courses, CP |
Crystal Lattice*Structures 
Indexed by Strukturbericht Designation Pearson Symbol Space Group Prototype Structures of Intermetallic Alloy Phases 
Simple Cubic and related structures 
Cubic Close Packed and related structures 
Body Centered Cubic and related structures 
Hexagonal Close Packed and related structures 
Carbon and Related Structures 
The Laves Phases 
Quartz (SiO2) and Related Structures 
Sulfur and its Compounds 
Lanthanides, Actinides,and Compounds 
IIIb-VIIb Elementsand Compounds 
Binary Pnma Alloys 
Other Structures Structures indexed by: Strukturbericht Designation Pearson Symbol Space Group Prototype References used in creating these pages. Programs used in creating these pages. Other sources of information about crystal lattices can be found at various sites around the Web. 