2 | | The Grapes of New York | HEDRICK, U.P. | J.B. Lyon Company, Albany | 1908 | COLUMBIAN IMPERIAL | 218 |
233 | | Grape development and improvement. Yearbook of Agriculture 1937, 631-664 | SNYDER, E. | U.S. Government Printing Office, Washington | 1937 | COLUMBIAN IMPERIAL | 638 |
237 | | American grape varieties | DIX, I.W.; MAGNESS, J.R. | U.S. Dep. of Agriculture, Washington D.C. (437) 1-33 | 1937 | COLUMBIAN IMPERIAL | 21 |
40503 | | USDA GRIN Germplasm Resources Information Network | ANONYMOUS | United States Department of Agriculture, Agricultural Research Service | 2016 | COLUMBIAN IMPERIAL | 1471 |