1557869774 SHOW MOOCHABLE + ? RELATED SEARCHES > ADVANCED SEARCH > SHOW COVERS + ASIN Copies Bruce G. Trigger Sociocultural Evolution: Calculation and Contingency (New Perspectives on the Past) 0 Search BookMooch for a book: SEARCH BOOKMOOCH > Search Amazon for a book: amazon.co.uk amazon.de amazon.es amazon.fr amazon.it amazon.cn SEARCH AMAZON >