SAN MARINO, CA.- The Huntington Library, Art Collections, and Botanical Gardens announced today it will add to its Library holdings an extraordinary group of 35 letters written by Charles Dickens (1812-1870). The set of letters is one of four new acquisitions selected by the Library Collectors Council at its 13th annual meeting on Jan. 16. Also selected were A Monograph of the Paradiseidae, or Birds of Paradise, a spectacularly illustrated, hand-colored ornithological book published in 1873; an important group of photographs of Santa Barbara, Calif., by the firm Hayward and Muzzall produced in the late 1800s; and an elaborately illuminated English manuscript made in the 1590s to commemorate the victorious Siege of Calais in 1347. The Huntingtons