American Society for Microbiology

http://www.asm.org/

Society for Industrial Microbiology

http://www.simhq.org/

International Society for Microbial Ecology

http://www.microbes.org/

American Association for the Advancement of Science

http://www.aaas.org/

Theobald Smith Society

http://users.tellurian.com/tss/

NEMPET North Eastern Microbiologists -- Physiology, Ecology and Taxonomy

http://www.nempet.rutgers.edu/

American Type Culture Collection (ATCC)

http://www.atcc.org/

German Collection of Microorganisms and Cell Cultures (DMSZ)

http://www.dsmz.de/dsmzhome.htm

World Data Centre for Microorganisms (WDCM)

http://wdcm.nig.ac.jp/

The National Center for Biotechnology Information (NCBI)

http://www.ncbi.nlm.nih.gov/

Ribosomal Database Project

http://rdp.cme.msu.edu/html/

Bergey’s Manual Trust

http://www.cme.msu.edu/Bergeys/

The FDA "Bad Bug Book"