U. S. Bureau of Fisheries, 1937 
Bulletin No. 22 
Figure 1.— U. S. Quarterboat S 48 , the floating laboratory of the United States Bureau of Fisheries. 
Figure 2. — U. S. Fisheries cruiser 56, equipped with sounding and sampling booms and field-laboratory apparatus. Two such 
cruisers were used on the larger rivers “and streams. 
