A 1992, Rasmussen ya ɗauki matsayin mataimakin S. Dillon Ripley, tsohon sakataren Smithsonian, wanda ke shirin samar da cikakkiyar jagora ga tsuntsayen Kudancin Asiya. Lokacin da ya yi rashin lafiya ba da daɗewa ba bayan fara aikin, Rasmussen ya ɗauki aikin, kuma tare da mai zane John C. Anderton, ya samar da tsuntsaye na Kudancin Asiya: Jagorar Ripley, jagorar tsuntsaye na kundin biyu don yankin Indiya wanda shine jagorar filin farko don haɗa da sonograms. Volume 1 ya ƙunshi jagorar filin tare da zane-zane sama da 3400 a cikin faranti 180, da kuma fiye da 1450 taswirar launi. Volume 2 (Abubuwa da Matsayi) yana ba da ma'auni na samfurin, game da ganowa, rarraba, matsayi, da halaye.
Assam, Arunachal Pradesh, Bangladesh da kuma Afghanistan