Capsule Review April 1978 Issue The Panama Canal Controversy: U.S. Diplomacy and Defense Interests by Paul B. RyanReviewed by Richard G. HeadAbout the Author: My FA Anthologies Read more by Richard G. Head In This Review The Panama Canal Controversy: U.S. Diplomacy and Defense Interests By Paul B. Ryan Hoover Institution, 1977 198 pp. $5.95 Purchase Facebook Twitter Email My FA Saved Articles Print A timely monograph, combining a historical overview with issue analysis. Ryan's conclusion, that the current treaties do not adequately protect U.S. defense interests, tends to color his presentation.