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FIGURE 4.-United States imports of crude and products, by products, quarterly, 1946-49.

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FIGURE 5.-Production and value of natural gas in the United States, 1916-49.

TABLE 3.-Production, value, employment, output per man, number of mines, and mechanization in the bituminous-coal and lignite-mining industries in the United States, 1905, 1910, 1915, 1920–49

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1 Figures on value per ton for 1905, 1910, 1915, 1920 to 1936, inclusive, and 1939, exclude selling expense. Figures for other years include selling expense.

2 Percentages for 1905 and 1910 are of total production, as a separation of strip and underground production is not available for those years.

3 Data not available.

4 Average number of men working daily.

5 Preliminary.

Source: Coal Economics Branch, Fuels and Explosives Division, Bureau of Mines, Department of the Interior, June 9, 1950.

CONSUMPTION

TABLE 4.-Consumption of bituminous coal and lignite, by consumer class, with retail deliveries in the United States, 1933-49, in thousands of net tons

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1 Federal Power Commission. Represents latest available revised figures for bituminous coal and lignite consumed by public-utility power plants in power generation, including a small quantity of coke amounting to approximately 100,000 tons annually.

2 Bureau of Census, U. S. Department of Commerce.

Association of American Railroads. Represents consumption of bituminous coal and lignite by class I railways for all uses, including locomotive, powerhouse, shop, and station fuel. The Interstate Commerce Commission reports that in 1948 consumption for all uses by class I line-haul railways, plus purchases for class II and class III railways, plus purchases by all switching terminal companies combined was 99,793,401 tons of bituminous coal and lignite.

4 Includes a small amount of anthracite.

Estimates based upon receipts collected from a selected list of representative manufacturing plants and retail dealers.

The total of classes shown approximates grand total consumption. It is not appropriate to "calculate" consumption from production, imports, exports, and changes in stocks because certain significant items of stocks are not included in year-end stocks. These items are: stocks on Lake and tidewater docks, stocks at other intermediate storage piles between mine and consumer and coal in transit.

7 Subject to revision.

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FIGURE 6.-Trends of production, employment, mechanization, and output per man at bituminous coal and lignite mines in the United States, 1905-49.

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