Organizations and companies are offering the following toll-free numbers and addresses for those interested in information they are providing:

-Experts estimate that the numbers of school-age children who spend some time at home alone each day range from 2.1 million to 6 million.The American Home Economics Association and the Whirlpool Foundation have joined forces to find alternatives in after-school programs for latchkey children through Project Home Safe.

Anyone seeking information related to school-age child care or children in self-care can contact the group's resource center toll-free by calling 1-800-252-SAFE. For information about programs near your area call 1-800-424-8080.

-Du Pont has reissued its "Guide to Family Camping" and "How to Select a Sleeping Bag" brochures. The camping guide was written by John Roskelley of Spokane, Wash., one of America's foremost mountaineers. Both offer good tips, along with a few plugs for Du Pont fibers.

For free booklets write to P.O. Box 5043, Ronks, PA 17573.

-"The Soothing Facts" is a booklet on how to recognize the harmful effects of stress and some tips on how to manage it. It was produced by Dazey Corp. and Gail North, co-author of "Women's Burnout: How to Spot It, How to Reverse It and How to Prevent It." It's interesting even if you're not interested in the three paragraphs about Dazey's TurboSpa.

Send a self-addressed, stamped No. 10 envelope to Dazey TurboSpa Stress Book, P.O. Box 263, Gardner KS 66030.