Tracy, W. W.  1872-1932. <br/><br/>
American varieties of lettuce. 
By W.W. Tracy, Jr. ... 
 - Washington,  Govt. Print. Off.,  1904. 
 - 103 p.  XXVII pl.  23 cm. 
 - United States. Dept. of Agriculture. Bureau of Plant Industry. Bulletin  no. 69 .
<br/><br/><label>LCCN: </label>agr09000201  
<br/><br/><label>LC Class. No.: </label>QK1  / .U45 no. 69