Preliminary Fold (aka Square Base) - Origami Expressions
File:Origami preliminary base.svg - Wikimedia Commons
Origami Preliminary Base Instructions
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Preliminary Base – Origami by AL
How to Origami a preliminary origami base « Origami :: WonderHowTo
Origami/Techniques/Model bases - Wikibooks, open books for an open world
Bases
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Origami Preliminary Base Instructions
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Origami Preliminary Base Instructions
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Origami Folding Instructions - How to make an Origami Square Base
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ArchGuide: Learn to fold Origami Square Base and Origami Bird Base
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Origami Folding Instructions - How to make an Origami Square Base
Origami Preliminary Fold
