Robinson, Spider. <br/><br/>
Time travelers strictly cash / 
by Spider Robinson. 
 - New York, N.Y. :  Ace Books,  1969. 
 - 200 p. 
<br/><br/> Title on cover : another night in Callahan's crosstime saloon. 
<br/><br/><label>ISBN: </label>0441807135 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Fiction--Science fiction--General.