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Analyses of Samples of Delivered Coal: Collected from July 1, 1915 to January 1, 1922, with a Chapter on the Tidewater Pool Classifications
From Introduction: "The analyses given in this bulletin are of samples of delivered coal. This bulletin gives the results of analyses of samples delivered coal collected from July 1, 1915 to January 1, 1922."
Date:
1923
Creator:
Snyder, Ned H.
Object Type:
Report
System:
The UNT Digital Library
Pennsylvania Railroad System, the route of the Broadway Limited.
Map shows major railroad lines across the midwestern and northeastern states; state boundaries, cities and towns along railroad routes. Includes text notes in panels above and below map. Relief shown by hachures. Scale not given.
Date:
1923
Creator:
Allen, Lane & Scott
Object Type:
Map
System:
The Portal to Texas History
Underground Ventilation at Butte
From Introduction: "The officials of the North Butte mine we engage in making a study of ventilation problems before the coming of the investigators, so that opportunity was given to work with those officials for several months. This bulletin is a result of studies made from the data collected during the two and one-half years of study and observation above outlined."
Date:
1923
Creator:
Harrington, Daniel
Object Type:
Report
System:
The UNT Digital Library