Drummond R O

Chemicals Tested As Acaricides To Control One-Host Ticks, U. S. Livestock Insects Laboratory, 1962-77 (Classic Reprint)

Materials Screened As Animal Systemic Insecticides At Kerrville, Texas, 1967-1973 (Classic Reprint)

Levantamento De Reconhecimento Dos Solos Do Estado Di Rio De Janeiro Et Distrito Federal(Contribuiçao À Carta De Solos Do Brasil) [ First Edition ]