Greenburg (1926) recommended medical removal if an employee developed clinical symptoms of poisoning, or if blood values for individual workers dropped 25 % or more.

Greenburg et al. (1926) recommended medical removal if an employee developed clinical symptoms of poisoning, or if blood values for individual workers dropped 25% or more. 1.1.2.

Similarly, usage of lead in ballast or ammunition is not as environmentally hazardous as usage of lead in gasoline.

2( h e y hn w n c a s t erctmic OFFICERS Presidcnt P aul V.

., Chicago 1926 CUMULATIVE INDEX TO THE PROCEEDINGS OP THE NATIONAL SAFETY COUNCIL FOR THE YEARS, 1919-1925.

., Chicago 1926 CUMULATIVE INDEX TO THE PROCEEDINGS OP THE NATIONAL SAFETY COUNCIL FOR THE YEARS, 1919-1925.