A Style Plus article Monday incorrectly said that a set of maps, charting 92 miles of the C&O Canal above Washington, is free. The set of five maps costs $4.50 and may be obtained by writing to the Interstate Commission on the Potomac River Basin, Suite 300, 6110 Executive Blvd., Rockville, Md. 20852-3903.

Guides to Washington the city are plentiful: A minilibrary of books, elegant maps and pamphlets giving depth and detail about virtually every neighborhood in and around the city.

Some favorites for walkers:

Flashmaps -- Every walker needs a copy of this slender but all-inclusive guide. For $3.95 you'll have 46 single-subject color-coded cross-indexed maps of everyplace you could possibly want to get to: 3,000 entries in all.

Washington on Foot, edited by John Protopappas and Lin Brown (American Planning Association and Smithsonian Institution, $4.95) -- With historical and architectural depth, the 24 walks steer you through preserved colonial and federal quarters, commercial districts, residential neighborhoods, urban renewal areas, as well as monuments and museums.

Dupont Kalorama Museum Walk -- Takes you around the area's seven museums (free with self-addressed envelope from Dupont Kalorama Museums Consortium, 1600 21st St. NW, Washington, D.C. 20009). Together with Dupont Circle Revisited: A Walker's Tour (free from shops in the area, or send $2.50 to L'Enfant Trust, 1731 21st St. NW, Washington, D.C. 20009), you can cover a lot of ground in a day.

Glimpses of Georgetown by Mary Mitchell (Road Street Press, $12.50) -- A small volume with text and photographs to guide you through the noncommercial streets of Georgetown. Tells you what's behind the old grillwork, fire marks, winding stairs, courtyards and intriguing gardens that pique the true walker's curiosity.

Running Washington by Chuck Dougherty (Vandamere Press, $6.95) -- Luckily for the walker, Dougherty made his way through 101 trails that crisscross the city and snake out to the suburbs, rating and mapping each. A typical example reads: "Find the trail on the north side of the road behind a small grass-covered park and under a railroad trestle," but amazingly, the directions work. The author doesn't hesitate to caution where he has seen or heard about danger on the trails. His dictum "Never run alone" applies to walkers, too.

Finding Birds in the National Capital Area, by Claudia Wilds (Smithsonian Institution Press, $10.95) -- Guide to the more than 180 species of birds that can be found in the city limits: screech owls, turkey vultures, canvasbacks, coots, herons and shorebirds.

Natural Washington, by Bill and Phyllis Thomas (Holt, Rinehart and Winston, $14.95) -- Tour the parks, wildlife sanctuaries, trails, gardens, swamps, marshes, forests, tree refuges and wild places within a 50-mile radius of D.C.

Country Walks Near Washington, by Alan Fisher (Appalachian Mountain Club, $6.95) -- Fisher takes some unusual walks -- through Greenbelt Park, the Northwest Branch of the Anacostia River and Fort Circle, with emphasis on historic detail: Civil War battles, military embankments, old grist mills.

Towpath Guide by Thomas Hahn (American Canal and Transportation Center, $10) -- A step-by-step guide to the C&O Canal. Also, a new set of maps charting 92 miles of the most popular parts of the canal above Washington can be had, for free, by writing to the Interstate Commission on the Potomac River Basin, Suite 300, 6110 Executive Blvd., Rockville, Md. 20852-3903.

Home on the Canal (Seven Locks Press, $19.95) -- History of George Washington's brainchild -- "the old ditch," as detractors called it -- shown through old photographs, historical detail and homey recollections.

Beginner's Guide to Wildflowers on the C&O Canal, by Edwin Martin (Smithsonian Institution Press, $8.95) -- Exquisite photographs and brief descriptions of 120 wildflowers.