Mysteriously this field guide, long our favorite, disappeared from the market for five years. It's back and just as good as ever. This descriptive guide, which has the added advantage of fitting in your pocket, features color paintings illustrating each species, 130 black-and-white photographs and good information on natural history and conservation. Our ten-year-old copy has been everywhere. Take it on all your ocean-going voyages.  (FG06, $18.00)