TY - MANSCPT DB - Science History Institute DP - Science History Institute M2 - Courtesy of Science History Institute. Rights: No Known Copyright TI - Portrait of Henry G. Knight ID - 1n79h462q DA - 1930/// YR - 1930 AV - Travis P. Hignett Collection of Fixed Nitrogen Research Laboratory Photographs, Box 3 VL - Travis P. Hignett Collection of Fixed Nitrogen Research Laboratory Photographs, Box 3 AN - Travis P. Hignett Collection of Fixed Nitrogen Research Laboratory Photographs, Box 3 UR - https://digital.sciencehistory.org/works/1n79h462q AB - Portrait of Dr. Henry G. Knight, Chief of the U.S. Department of Agriculture's Bureau of Chemistry & Soils. KW - United States. Bureau of Chemistry and Soils KW - Knight, Henry G. KW - Portraits KW - United States. Department of Agriculture LA - ER -