In Guatemala, Maudslay began the major archaeological work for which he is now best remembered. He started at the Maya ruins of Quirigua and Copan where, with the help of Frank Sarg, he hired labourers to help clear and survey the remaining structures and artefacts. Sarg also introduced Maudslay to the newly found ruins in Tikal and to reliable guide Gorgonio López. Maudslay was the first to describe the site of Yaxchilán. With Teobert Maler, Alfred Maudslay explored Chichén in the 1880s and both spent several weeks at the site and took extensive photographs. Maudslay published the first long-form description of Chichen Itza in his book, "Biologia Centrali-Americana".