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Excerpt from Mines and Quarries, 1919: General Report and Analytical Tables and Reports for States and Selected Industries
The supplemental schedules contained inquiries in relation to quantity and value of products and data of a technical nature peculiar to each industry or class of minerals. These schedules followed substantially the forms used by the Geological Survey in its annual collection of statistics, with, however, some additions and modifications intended to bring the data in har mony with that developed by the general schedule.
Except in the case of the mineral-fuels, iron-ore, and phosphate-rock industries, for which the quantity of products was transcribed from the supplemental schedules to the general schedules, the supplemental schedules were used by the Bureau of the Census only for the purpose of classifying the general schedules according to mineral industry. The supplemental schedules were transmitted to the Geological Survey for tabulation.
Scape of the contra - Census statistics of mines and quarries and petroleum and natural-gas wells were compiled primarily for the purpose of showing the absolute and relative magnitude of the different branches of industry covered and their growth or decline. Incidentally, the effort is made to present data throwing light upon character of ownership, size of enterprises, and similar subjects. When use is made of the statistics for these purposes, it is impera tive that due attention be given to their limitations, particularly in connection with any attempt to derive from them figures purporting to show average wages, cost of production, or profits.
Territory covered. - The census of mines and quar ries for 1919, taken in connection with the Fourteenth Decennial Census, covered the United States proper, also Alaska, Hawaii, and Porto Rico.
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