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→Scientific articles and research
| Clifford, MM, Cleary, P
| 1971
| [httphttps://raspunicumprino.deneocities.org/www/miscclifford-cleary/Clifford_Odds_Hitchhikethe-odds-in-hitchhiking.pdf html The Odds in Hitchhiking]
| University of Iowa/University of Wisconsin
| EN
