You can find the Spanish-language paperback version on the US Amazon site here (pricey!):
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Don't worry about it. You're only starting out, so it may be good just to get a feel for Lovecraft's style.
I've got that version, which may feature all his stories, I'm not sure though.
It's pretty damn sturdy for a book of that price. Heavy too. The only drawback is the formatting. There are no empty spaces after periods.The font is pretty small, but that's not really a problem for me. It was pretty cheap (like $15), so I think it was worth it.
That said, there are better versions out there, so I'd look at a lot of reviews and possibly have a look inside a copy.
This is where to start: The Encylopedia Cthulhiana
It's a complete encyclopedia of every single modern reference to anything and everything Lovecraft. Best part? It has a complete Bibliography of all books considered part of the expanded Lovecraft universe including books that inspired Lovecraft, books written by his friends and contemporaries and nearly everything written since his death. We're talking hundreds of volumes.
That all said, if you are looking for a damn good book to read, I'm going to recommend the Colour Out of Time, a direct sequel to Color out of Space written by Michael Shea. He has a bit more of a modern style of writing, but he expertly captures the ebb and flow of HP Lovecraft. If you loved the original Colour Out of Space, you're going to love this book too.
There is a fantastic book by the title Encyclopedia Cthulhiana that has a bibliography with almost every single bit of mythos literature written up to 1998. Not only that, but it's a great reference guide to authors, places, creatures, books and really everything Mythos.
If you want a quick recommendation though, I loved Robert Howard's mythos stories. TED Klein wrote a fantastic novel called "The Ceremonies." and Brian Lumley's "Goatwood", "Necroscope" and "Titus Crow" books are all either very Lovecratian or a continuation of the Mythos.
Mmmm, I think he's a reasonably good writer who can structure stories very well. I doubt he will be remembered particularly for his literary merit.
Dance Macabre is a good read if you're interested in the genre, though. http://www.amazon.com/Stephen-Kings-Danse-Macabre-King/dp/0425104338