OBNB doesn't sell books, but you may be able to find a copy at one of these websites:
La Frontera del Estado Inca : proceedings [of the] 45 International Congress of Americanists, Bogotá, Colombia 1985. ISBN 0860545695. Published by B. A. R. in 1988. Publication and catalogue information, links to buy online and reader comments.
![La Frontera del Estado Inca : proceedings [of the] 45 International Congress of Americanists, Bogotá, Colombia 1985](http://ecx.images-amazon.com/images/I/41guthQ2bfL._SL160_.jpg)