By Houk, J. T. Dock..
New York Praeger 1967 .
xi, 177 p. 25 cm..

.
v. 28 cm..

By Michelsen Niño, Pablo..
Bogotá [s.n.] 1981 .
126, [45] p. 24 cm..

Dobbs Ferry, N.Y. Oceana Publications 1978 .
v. <1-6 > 27 cm..
0379102447 (series)

By Glade, William P.
Madison University of Wisconsin Press 1963 .
vii, 242 p. 23 cm..

By Méndez Méndez, Segismundo..
Bogotá, Colombia [s.n.] 1986 .
iii, 218, 3, [5] p. 22 cm..