Letter of transmittal
Wilson, H.J., Howard, L.O.
Letter of transmittal - Washington 1997 - 1-154 p. - Uniited States Department of Agriculture, Division of Entomology. Technical Series Bulletin No. 7 .
Letter of transmittal - Washington 1997 - 1-154 p. - Uniited States Department of Agriculture, Division of Entomology. Technical Series Bulletin No. 7 .