By doing a forum search for "agencies":

Agencies for petite Models
https://www.modelmayhem.com/posts.php?thread_id=51160

Agencies for under 5'9"
https://www.modelmayhem.com/posts.php?thread_id=53526

"Reputable" Agencies for Unconventional Models
https://www.modelmayhem.com/posts.php?thread_id=52122

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By doing a forum search for "petite":

Y Can't petite models have the same priviliges
https://www.modelmayhem.com/posts.php?thread_id=31167

do you think runway will ever have a petite part..
https://www.modelmayhem.com/posts.php?thread_id=27480

Is there really a petite market?
https://www.modelmayhem.com/posts.php?thread_id=23546

any petite runway modeling job?
https://www.modelmayhem.com/posts.php?thread_id=20130

Petite Modeling?
https://www.modelmayhem.com/posts.php?thread_id=16576

petite model question..
https://www.modelmayhem.com/posts.php?thread_id=9620

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By doing a forum search for "short":

Agenices in California that take on short models??
https://www.modelmayhem.com/posts.php?thread_id=53918

What am I *NOT* too short for?
https://www.modelmayhem.com/posts.php?thread_id=49376

Short Models....
https://www.modelmayhem.com/posts.php?thread_id=29355

Short Models?
https://www.modelmayhem.com/posts.php?thread_id=30071

how do short models go about getting signed?
https://www.modelmayhem.com/posts.php?thread_id=26220

Short Models?
https://www.modelmayhem.com/posts.php?thread_id=19935

About Models being too short
https://www.modelmayhem.com/posts.php?thread_id=17963

Short Models
https://www.modelmayhem.com/posts.php?thread_id=2064

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More info:
http://www.newmodels.com/height.html
http://www.newmodels.com