The Ancient Civilizations of Peru

In 1957 this was a going thing? But a lot has been dug up on the civilizations involved including aerial photography of Nazca desert figures. The glossary of Spanish and Quechua words is very useful as is the history of the different surviving sites. He says that there is evidence of pre-Clovis people in South America well before it was accepted by the mainstream. The oceanic route to the new world seemed only remotely possible at the time, but seems to have gained a lot in even the last five years. The Inca were a bronze age culture and if the Spanish hadn't arrived, might in the near future have clashed with the Aztecs? I'm glad to have this book for reference.