title: Orbital bar pressing. A historical note on Skinner and the chimpanzees in space.
authors: Institute for Environmental Research, Kansas State University, Manhattan 66506.
authors: F H
authors: FH
authors: Rohles
mesh_terms: D000818:Animals; D003216:Conditioning, Operant; D002679:Pan troglodytes; D011589:Psychology, Experimental; D013026:Space Flight