Search Results       Your search for [author]Sweetman, Harvey Leroy, 1896- returned 1 record.           The principles of biological control; interrelation of hosts and pests and utilization in regulation of animal and plant populations. by Sweetman, Harvey Leroy, 1896-; Dubuque, Iowa: W.C. Brown Co., 1958. Subject: Insects, Injurious and beneficial -- Biological control; Agriculture pests.          Add to Book Cart Relevance: 30.52%