To properly transport mail from the main office to the various stations, electric-line terminals, steamboat wharves, and aviation fields, and to make collections from the street letter boxes and deliver parcel-post packages, the office operates a fleet of fully 100 Government-owned automobile trucks. Designed by Graham Anderson, Probst & White and built of white Vermont granite, the addition was completed in 1937 and it doubled the size of the city post office. LIBRARY OF CONGRESS The Library of Congress, the world’s largest and most elaborate building devoted wholly to library uses, occupies two city squares east of and facing the Capitol Grounds, also an addition recently completed. The architecture is of the Italian Renaissance order, from plans made by J. J. Smithmeyer and Paul Pelz, and modified by Edward P. Casey. The exterior walls are of New Hampshire granite. Fifty masters of painting and sculpture worked together to make it a treasure house of the best contemporary American art, fit to shelter one of the greatest libraries of the world. Army engineers superintended its construction. Begun in 1886, completed in 1897, the building measures 340 feet by 470 feet and covers about 3¹⁄₂ acres. Its cost to date has been $7,868,951. The addition was designed by Pierson & Wilson, architects of Washington, and built of Georgia marble. In front of the Library is a bronze fountain by Hinton Perry, sculptor, representing the Court of Neptune. The grand stair hall of the entrance pavilion is of Italian white marble, is particularly beautiful at night, when visitors delight to see it. It leads to the great rotunda, which is the reading room. To the right are the library rooms of Senators and Representatives and the periodical room. To the left are the rooms for the blind and the conservatory of music. On the second floor at the head of the staircase is Elihu Vedder’s famous mosaic, Minerva. On this floor also are on exhibition the original Declaration of Independence, the original Constitution of the United States, and the Gutenberg Bible. To the right is the prints division, now called the division of fine arts, and to the left the manuscripts division. [Illustration: LIBRARY OF CONGRESS--GRAND STAIRCASE] The reading room contains the card-index catalogue of the books in the Library, will accommodate 1,000 readers at a time, and is free to any reader over 16 years of age. The alcoves are devoted to books on particular subjects.