69. 
70. 
a 
~sI 
nN 
Papers 
James Millholland and Early Railroad Engineering . 
Joun H. Waite 
William Gunn Price and the Price Current Meters 
ARTHUR H. FRAZIER 
Sir William Congreve and his Compound-Plate Printing . 
EvizasetH M. Harris 
Anthracite in the Lehigh Valley of Pennsylvania, 1820-45 
Joun N. HorrMan 
Index 
Page 
3H) 
69 
89 
143 
