1. Paleoenvironmental reconstruction at Meadowcroft rockshelter, Washington County, Pennsylvania;Adovasio,1985
2. Secuencia arqueológica del alero rocoso de San Pedro Viejo de Pischasca (Ovalle, Chile);Ampuero;Boletín del Museo Arqueológico de la Serena,1971
3. Climate variations and the rise and fall of an Andean civilization;Binford;Quaternary Research,1997
4. South American radiocarbon dates;Bird;Memoirs of the Society for American Archaeology,1951
5. The occurrence in Panama of two types of Paleo-Indian projectile points;Bird,1978