These aren't the only things out there of course, but it should get you started and keep your drawing busy. Available in smaller, more digestible chunks at www.htdhorses.com :
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Top tips for choosing a saddle
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The Parts of the Western Saddle and the English Saddle.
Western saddles have a number of different parts that make the saddle both functional and effective. It is important for riders to know the parts of the saddle in order to determine the correct saddle size they need and learn how to tell the different types of western saddles apart.
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Ș-am încălecat pe-o șa și v-am spus povestea duminicală by Lelea Lucreție