"Montgomery High School students." An amusing (or maybe unsettling) class portrait from Montgomery County, Maryland. The Library of Congress says circa 1936; we've found a number of clues that narrow it down to 1939-40. See the comments for details. National Photo Company safety negative. View full size.

September 3, 1923. "Police and Firemen's ballgame." At Griffith Stadium in Washington, D.C., Barney and Spark Plug from the popular comic strip "Barney Google." National Photo Company Collection glass negative. View full size.

Silver Spring, Maryland. Typing class at Montgomery Blair High School in 1935. 5x7 safety negative, National Photo Company Collection. View full size.

"District of Columbia. Washington Loan & Trust building." A street scene circa 1907, possibly on Flag Day. National Photo glass negative. View full size.

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"Baltimore Fire of 1904. General view of South Baltimore." National Photo Company Collection glass negative, Library of Congress. View full size.

"Great Baltimore Fire of 1904. Fighting the fire on Baltimore Street." The first in a series of photographs from the fire, which burned for two days in February 1904, consuming much of downtown Baltimore. National Photo Company Collection glass negative, Library of Congress. View full size.