http://www.helium.com./knowledge/63555-anton-van-leeuwenhoeks-contributions-to-microbiology.xml Helium.com > Microbiology > Anton van Leeuwenhoek's contributions to microbiology en-us Copyright Helium.com Mon, 05 May 2008 19:39:55 GMT Mon, 05 May 2008 19:39:55 GMT