The book "Albert Einstein - Mileva Maric: The love letters" contains 54 letters covering the period from October 1897 to September 1903. They are now considered by some people a proof of Albert- Mileva scientific cooperation. In the letters Albert and Mileva share their emotions and tenderness, and also scientific ideas. Albert considers Mileva as intelectualy equal and discusses physics with her. In the Letter 21 Einsteins talks about "our new papers". In the Letter 23 Albert says to Mileva that she is his equal. In the Letter 25 Albert writtes to Mileva about "our work on relative motion". Unfortunately, there are only 11 letters from Mileva to Einstain and the question is were the rest of them deliberately destroyed to hide the evidence of her work.