PYRAMID PROBLEM
Reading edition
OR,
PYRAMID DISCOVERIES.
WITH A NEW THEORY AS TO THEIR ANCIENT USE.
BY
ROBERT BALLARD,
M. INST. C.E., ENGLAND; M. AMER, SOC. C.E. CHIEF ENGINEER OF THE CENTRAL AND NORTHERN RAILWAY DIVISION OF THE COLONY OF QUEENSLAND, AUSTRALIA.
NEW YORK: JOHN WILEY & SONS. 1882
Copyright, 1882, By JOHN WILEY & SONS.
PRESS OF J. J. LITTLE & CO., NOS. 10 TO 20 ASTOR PLACE, NEW YORK.