S.P. Singh Principles of Vegetable Production - Udaipur Agrotech Publishing Acadamy 1997 - 288p S.P. Singh: Principles of Vegetable Production. Udaipur. Agrotech Publishing Acadamy, 1997. 81-85680-27-2--(635.1SIN) ENGLISH ISBN: 81-85680-27-2 Dewey Class. No.: 635.1 / SIN