A fantastic professional international organization for children's book writers and illustrators.

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The national voice for Canada’s library communities. 

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"Supporting and informing the children's book publishing industry and fostering literacy."

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The children's literature branch of the American Library Association (ALA).

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Thanks Amelia for this link to a great resource for young writers - A Resource Guide to Writing Basics:
http://coolotters.weebly.com/hand-hobbies.html
Good luck with your writing, Amelia!