There have been many excellent books written on the art of sand sculpture - the Amazon.com banner to the right provides direct links to some of them....

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Sandcastles Made Simple by Lucinda "sandy feet" Wierenga

A Day at the Beach by DR Smith

Instructional DVDs (also available in VHS)

• Sandcastling for Beginners by the SoBs
• Intermediate Sandcastling by the SoBs