© 1977 by Hal D. Sears. All rights reserved. Reissued 2021. The text of this book is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Public License.
Except where otherwise noted, this item's license is described as: © 1977 by Hal D. Sears. All rights reserved. Reissued 2021. The text of this book is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Public License.