Problems in aerial application [electronic resource] : a comparison of the acute effects of endrin and carbon tetrachloride on the livers of rats and of the residual effects one month after poisoning / George Clark.
[Washington, D.C.] : Federal Aviation Agency, Office of Aviation Medicine, 
Electronic reproduction. Washington, D.C. : FAA. Mode of access: Internet from the FAA web site. Address as of 2/27/07: http://www.faa.gov/library/reports/medical/oamtechreports/1960s/media/AM66-34.pdf; current access is available via PURL.