IV BUREAU OF ANIMAL INDUSTRY. 
Part 21, pages 1575-1624.— Authors O to Ozzard. Issued July 8, 1908. Price 10 
cents. 
Part 22, pages 1625-1718.— Authors P to Pfeilsticker. Issued February 13, 1910. 
Price 15 cents. 
Part 23, pages 1719-1805. — Authors Pfender to Qvortrup. Issued February 16, 
1909. Price 15 cents. 
Part 24, pages 1807-1893.— Authors R to Rizzo. Issued October 9, 1909. Price 10 
cents. 
Part 25, pages 1895-1979. — Authors Roack to von Rzewuski. Issued November 29, 
1909. Price 1 10 cents. 
Part 26, pages 1981-2076.— Authors S to Schnyder. Issued June 2, 1910. Price 
15 cents. 
Part 27, pages 2077-2168.— Authors Schoch to Silvestrini. Issued July 5, 1910. 
Price 15 cents. 
Part 28, pages 2169-2250.— Authors Sim to von Stenitzer. Issued July 16, 1910. 
Price 10 cents. 
Part 29, pages 2251-2326. — Authors Stenroos to Szymanski. Issued July 25, 1910. 
"Pnop TO ppnts 
Part 30, pages 2327-2386.— Authors T to Thon. Issued September 7, 1910. Price 
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Part 31, pages 2387-2442.— Authors Thooris to Utz. Issued September 8, 1910. 
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Part 32, pages 2443-2508.— Authors V to Vyner. Issued October 11, 1910. Price 10 
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SUBJECT INDEX. 
Trematoda and trematode diseases <Bull. 37, Hyg. Lab., U. S. Pub. Health & Mar.- 
Hosp. Serv., Wash., June, 1908, 401 pp. [W a , W m .] 
