1909 report on government coal purchases

Found this old report on the internet-

Thought it might be of interest.

RESULTS OF PURCHASING COAL UNDER
GOVERNMENT SPECIFICATIONS
by John Shober Burrows

WITH A PAPKK ON
BURNING THE SMALL SIZES OF ANTHRACITE
FOR HEAT AND POWER PURPOSES

by DWIGHT T. RANDALL

WASHINGTON
GOVERNMENT PRINTING OFFICE
1909

Interesting, especially the end where the draft ratings are, and type coal/size being used. smaller size coal requires greater draft.. to keep air moving thru coal bed.