The Cave of the Oracle: The Great White Brotherhood by Dr. L. W. de Laurence (1916)
An occult self-instruction and mail-order text issued by Dr. L. W. de Laurence in Chicago in 1916, sold to American readers of spiritualism, magic, and New Thought healing literature. The plates are letterpress magic squares — numbers set in ruled grids of five to nine columns, captioned as the front sides of talismans — offering designers tabular number layouts, hairline rule structures, and inked type on coarse paper.
