A comprehensive and widely used reference, ""The Oil and Gas Lease in Canada"" has been extensively cited by the courts. The first edition, published in 1973, served as the definitive legal guide to those engaged in securing and developing mineral rights in Canada. The revised and updated second edition, published in 1985, dealt with the nature and function of oil and gas leases, the procedures of entering into leases, the most common clauses and their effectiveness, and possible hazards and loop-holes in the leases. An important appendix to the second edition was the first model lease drafted specifically for the Canadian industry. That model was a fundamental source in the creation of a Canadian oil and gas lease by the Canadian Association of Petroleum Landmen (CAPL). Because today virtually all leases follow the CAPL form, the third edition examines these leases in detail. In addition, John Ballem takes into account new developments in the way cases have been decided since 1985.;Like its predecessors, this new edition is designed as a user-friendly road map through the maze that surrounds the Canadian oil and gas lease, as well as the very substantial body of law that has arisen around it. The oil and gas lease is an ever-evolving document and as such, those who work with it must continuously adapt to the endless variety of leases that arise with each new situation. It is this variety that makes the oil and gas lease such a challenging and fascinating instrument to work with and ""The Oil and Gas Lease in Canada"" such a useful book.