All of the following foreign policy failures occurred during the early 1960s except:
a. the invasion of cuba
c. the building of the berlin wall
b. laos falling to the communists
d. russian missile installation in cuba

in contrast, the biological controls are self-sustaining, inexpensive and very effective once established. biological control could be used on thousands of golf course acres, improving their biodiversity and quality as wildlife habitat. in the process, the golf industry will be shown to be leaders in an environmental stewardship program of benefit not only to the lands they manage but also to the watersheds in which they exist.