Scientific and conservation reports :  numbers 21, 22 and 23 / 
 Informes científicas y de la conservación, números 21, 22 y 23. 
Charles Darwin Foundation. 
 - Puerto Ayora, Galápagos, Ecuador :  Charles Darwin Foundation,  1970-1971. 
 -  28 cm 
<br/><br/> Scientific and conservation report : no. 23, May to August 1971 /  Scientific and conservation report : no. 22, January to April 1971 /  Scientific and conservation report : no. 21, September to December 1970 /  Peter Kramer and José Villa R.  Peter Kramer and Juan Black M.  Peter Kramer and Juan Black M.  (p. 1-8) --  (p. 1-8) --  (p. 1-9). 
<br/><br/><br/>Inglés 
<br/><br/><label>Dewey Class. No.: </label>506