Freedman, Paul The principles of scientific research / Paul Freedman; with an in troduction to the 2nd. ed. by C. H. Waddington. - Oxford ; New York : New York : Pergamon Press, [1960] - 227 p. ; 24 cm. Subjects--Topical Terms: Research-------- National Library of Medicine Call No.: Q 180.A1 / F875p 1960