Biochemicals and reagents for life science research. 

 - St. Louis, MO :  Sigma, ,  1998. 
 - v. :  ill. ;  23 cm. 
 - Annual. 
 - Began in 1997. 
<br/><br/> Description based on: 1999; title from cover. 
<br/><br/><label>Subjects--Corporate Names: </label><br/>Sigma Chemical Company-- Catalogs-- Periodicals.
<br/><br/><label>Subjects--Topical Terms: </label><br/>Life sciences--Equipment and supplies-- Catalogs-- Periodicals.<br/>Chemicals-- Catalogs-- Periodicals.<br/>Biological reagents-- Catalogs-- Periodicals.
<br/><br/><label>National Library of Medicine Call No.: </label>TP202