A Dictionary of American Proverbs by Wolfgang Mieder (Chairman, Department of German and Russian, Chairman, Department of German and Russian, University of Vermont)
This is an authoritative and hugely browsable treasury of over 15,000 sayings, adages, and maxims commonly used in the United States and Canada, including thousands that have never previously been recorded. Based on oral and written sources, it is the culmination of over 40 years' research, and covers thousands of uniquely American proverbs as well as those hailing from classical, biblical, European, and English literature.