Blackboard efficiency a suggestive method for the use of crayon and blackboard This book, "Blackboard efficiency a suggestive method for the use of crayon and blackboard", by Robert Fletcher Young Pierce, is a replication of a book originally published before 1922. It has been restored by human beings, page by page, so that you may enjoy it in a form as close to the original as possible. This book was created using print-on-demand technology. Thank you for supporting classic literature.