The Inverted Pyramid, Sinclair, Bertrand, Very Good Book

The Inverted Pyramid of Inclusion: A Personal Invitation from ... by McCabe, Des

Big Timber, A Story of the Northwest, Bertrand Sinclair, 1916 Hardback Logging

North of Fifty-Three (1914) Vintage book by Bertrand W. Sinclair

The Inverted Pyramid by A.C. Fuller (English) Paperback Book

The Hidden Places by Bertrand W. Sinclair (English) Paperback Book

Pender Harbour Cowboy: The Many Lives of Bertrand Sinclair by Keller, Betty

BEYOND THE INVERTED PYRAMID BY THE MISSOURI GROUP