International Microbiology, Vol 4, No 3 (2001) has a free article available online entitled Exploring Leeuwenhoek’s legacy: the abundance and diversity of protozoa, by Bland J. Finlay and Genoveva F. Esteban.
Available as a pdf download only.
Archive issues of International Microbiology, the journal of the Spanish Society for Microbiology, are also available online.
