Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The E61 anthrax bomblet was an American biological sub-munition for the E133 cluster bomb. This anti-personnel weapon was developed in the early 1950s and carried 35 milliliters of anthrax spores or another pathogen. The E61 bomblet was a half-pound anti-personnel bomb designed to be carried in the E133 cluster bomb. The cluster bomb was designed to hold about 540 of the E61 anthrax bomblets. The E61 held about 35 milliliters of agent and a variety of pathogens could be used, generally anthrax spores. The E61 was perceived as superior to its predecessors, the M33 cluster bomb and its payload of M114 bombs. In fact, four of the smaller E61 bomblets produced twice the coverage area of the larger M114 bomb. Upon impact the E61 would detonate releasing an aerosol of its anthrax spore laden slurry into the air of its target area.