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Grading Wool

Blanche HalbertCharles Abel BennettElmer Miller RowaltJames Wiley ChristieKarl Spangler QuisenberryKenneth Fisher WarnerNicholas Aloysius KesslerRoland McKeeFrancis Leo GerdesHarry August SchothJacob Allen ClarkThomas Laffin Baggette

出版	U.S. Department of Agriculture, 1938
URL	http://books.google.com.hk/books?id=hmBTAQAACAAJ&hl=&source=gbs_api