THE HISTORY OF INITIATION; OR, ACCOUNT OF THE RITES AND CEREMONIES, DOCTRINES AND DISCIPLINE, OF ALL THE SECRET AND MYSTERIOUS INSTITUTIONS OF THE ANCIENT WORLD GEORGE OLIVER 1829
WOMAN’S MYSTERIOUS INFLUENCE OVER MAN: HER SECRET POWERS AND HOW TO USE THEM; IMPORTANT SEX INFORMATION, ETC BERNARD FRANCIS 1920
SECRET CHAMBERS AND HIDING-PLACES: THE HISTORIC, ROMANTIC & LEGENDARY STORIES & TRADITIONS ABOUT HIDING-HOLES, SECRET CHAMBERS ALLAN FEA 1904
MYSTERIES AND MISERIES OF AMERICA’S GREAT CITIES; EMBRACING NEW YORK, WASHINGTON CITY, SAN FRANCISCO, SALT LAKE CITY, AND NEW ORLEANS J. W. BUEL 1883
GRAVITATION TELLS HER SECRETS: A COMPLETE SOLUTION OF THE PROBLEM, WITH THE MAJOR MYSTERIES OF SCIENCE
AMERICA ENTANGLED: THE SECRET PLOTTING OF GERMAN SPIES IN THE UNITED STATES AND THE INSIDE STORY OF THE SINKING OF THE LUSITANIA JOHN PRICE JONES 1917
THE SECRET OF SWEDENBORG; BEING AN ELUCIDATION OF HIS DOCTRINE OF THE DIVINE NATURAL HUMANITY HENRY JAMES 1869
THE STARS AND THEIR MYSTERIES: AN INTERESTINGLY WRITTEN ACCOUNT OF THE WONDERS OF ASTRONOMY, TOLD IN SIMPLE LANGUAGE CHARLES R. GIBSON 1916