Clever Hans (The horse of Mr. Von Osten): A contribution to experimental animal and human psychologyEbookClever Hans (The horse of Mr. Von Osten): A contribution to experimental animal and human psychologybyCarl L. RahnRating: 0 out of 5 stars0 ratingsSave Clever Hans (The horse of Mr. Von Osten): A contribution to experimental animal and human psychology for later