The reports on this map arc for exactly the same time; that is, although it was 7:30 p.m.

Eastern standard time, it was several hours earlier by the clock on the Pacific Coast.

2. Compare this method of indicating rain with the method shown in 234A.

CONTOUR MAPS

National Resources Board. "State PlannioK." 1035.

A. Topographic Map of Colorado, Showing Contour Lines af Intervals of 2000 Feet.

The combination of a topographic map and a profile section makes this a valuable map.

MacElwee 8i Crandall. Inc.. N Y C.

SCALE .4

B. Connparative Dates on Which the Chance of Killing Frost Falls to Ten Per Cent in the Spring in the United States.

GRAPHIC PRESENTATION

ARROWS INOlCtrE WIND DIRECTION

OIC*TE PREClPITATlPH

--2 :us£^

National Resources Board, "Rejxjrt of Water Planning Committee Part III," 1934.

A. Weather Map for the United States at 8:00 a.m., February 2. 1934.

1. Weather reports rather than weather maps are most often consulted in daily newspapers.

However, for an over-all view of the United States, this type of weather map is good.

2. Note particularly the use of shaded areas to indicate rain.

□ Erosion unimpo'toni, •icept locolly

a Moderate sheei and gully erosion, serious locoliy k/)Si qii wind erosion, tlUmode'Oie sheel ond gully erosion

■ Moderate to severe wind erosion, some gullying locally ■ Moderate lo severe erosion includes mesas, mountains, canyons ond bodlonds

^M Severe sheet and gully erosion WPA, Division of Social Research. "Landlord and Tenant on the Cotton Plantation," 1936.

B. General Distribution of Erosion in the United States in 1936.