There are many different resources around the internet that can benefit writers and their work. The utmost resource for any type of writer is writersmarket.com. The Writer's Market is has long been the bible for writers, editors, publishers, and literary agents.
In addition to being a contact index for the largest publishers in the world, the Writer's Market website also includes articles, reviews, and even tips and tricks from the highest authorities in the industry.
Though it does require a monthly subscription to access many of the features and articles, but $5.99 per month is a small amount to pay for a 1000-page phonebook of publishers actively seeking manuscripts for sale.
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