Would you please suggest me some German grammar and vocabulary books?
I'm looking for some German grammar and vocabulary books for beginner or pre-intermediate level which can be helpful.

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Answer

1.
http://www.amazon.de/Langenscheidt-Gro%C3%9Fw%C3%B6rterbuch-Deutsch-Fremdsprache-Gro%C3%9Fw%C3%B6rterb%C3%BCcher/dp/3468490429/ref=sr_1_2?ie=UTF8&qid=1363610575&sr=8-2

2.
http://www.amazon.de/PONS-Grammatik-b%C3%BCndig-Deutsch-Leicht-Merk-System/dp/3125616875/ref=sr_1_6?s=books&ie=UTF8&qid=1363610695&sr=1-6

Answer

momkene ke ketabhaye almanira dar iran becharid? 
tousieh mikonam Hueber-Verlag / Übungsgrammatik (für die Grundstufe / Mittelstufe). agar loghatnameh lazem darid: behtarin loghatnameh almani-farsi az Faramarz Behzad / Kharazmie Publication ast. pishrafte dashte bashid.