The complete collection of measured drawings that form the Historic American Buildings Survery - 38,000 drawings in all - has been microfilmed and copies are now available to the public.

The Historic American Buildings Survey (HABS) began in 1933, when the National Park Service employed architects, draftsmen and photographers under various federal relief programs to compile a "graphic record" of the nation's historic buildings. The survey became permanent with a 1934 agreement between the Park Service, the Library of Congress and the American Institute of Architects. The resulting collection is maintained by the Library of Congress.

All drawings made of the selected historic structures in the 50 states, Puerto Rico, the Virgin Islands and the Canal Zone can be purchased in a microfilm package of 66 35mm reels for $690, or a Xerox print package for $3,975.

Details are available from the Prints and Photographs Division, Library of Congress, Washington, D.C. 20540, or by calling 426-5108.

Today's the last day of the Ninth Annual Brunswick Potomac River Festival in Brunswick, Md. (near Frederick). The festival's 10 a.m. to 6 p.m. events include an art show, antique sale, craft shows and demonstrations and raft rides on the Potomac. There's a jousting tournament at 1 p.m. in the Brunswick City Park, a horseshoeing demonstration, helicopter rides and the nearby B&-O Railroad Museum. Details at the Brunswick Potomac Foundation: 834-7100.

Some of life's more cherishable things often turn out to be either favorite toys or hand-me-down antiques. Both abound at Cherishables, 1823 Jefferson Pl. NW. Here there are carousel horses, schoolhouse clocks, handmade quilts, old printers' letters, desks and antique trunks. And a roomful of toys includes "puddle-jumpers," a turn-of-the-century thing-a-mabob on the order of a flying top.

"Notable Needlework," a slide program, will be presented by author, researcher and collector Norman Papish at the Chevy Chase Library this Tuesday night, Thursday and Saturday. Papish is the developer and leader of the Smithsonian Institution's "200 Years of Needlework" tour.

The presentations are 8 p.m. Tuesday and 10 a.m. Thursday and Saturday at the library, 8005 Connecticut Ave. Details: 656-0494.

Stained glass by Dan Wheeler of Pittsfield, N.H., is on exhibit through Aug. 30 at Laurel Branch Library, 507 7th St., Laurel, Md. Free. Details: 776-6790.