Search Results Use the search box below to revise your search, or start a new search. Studies (2) Variables Publications Your query returned 2 studies. Series results are grouped under the most relevant study. Ungroup series results to view all results. Sort by: Title A-Z Released/Updated Time Period Most Cited in ICPSR Bib. 1. Survey of Botswana Political Participation, 1970: Mass Sample (ICPSR 7362) Holm, John D. 2. Survey of Botswana Political Participation, 1970: Secondary School Sample (ICPSR 7351) Holm, John D.