If you want to know something about a no-load mutual fund and cannot find it in "The Handbook For No-Load Fund Investors," then it probably is not worth knowing. Once again Sheldon Jacobs and the editors of The No-Load Fund Investor, a monthly newsletter, have assembled the best and most comprehensive guide available. The 524-page, large format book is packed with statistics on 1,183 no-load and low-load funds. In addition, it includes thumbnail descriptions of every fund, and hundreds of pages of guidelines and other information useful to novice and seasoned investors alike. The handbook is available by mail for $38. For a copy, write to The No-Load Fund Investor, P.O. Box 283, Hastings-on-Hudson, N.Y., 10706.