Viktor Henkin 1000 checkmate combinations, is it necessary! ?

Is it necessary to buy this book or any other combinations book similar to 

OR 

Maybe if I have books with annotated games such as zurich 1953, new York tournament 1927 and other games collection with annotated games,  I don't need combination book because I have all that in the game collection books or combination book is something different and I need to purchase it !? 

I'm confused here, can you clarify for me please 

I have books on endgame studies is it the same thing or...? 

I own the book.  It is not a book of endgame studies.  It is a book of middlegame combinations, from actual games, which lead to either checkmate of the threat of imminent checkmate. 

The closest other, very similar, book to Henkin's is...

Fundamental Checkmates by Antonio Gude

Do you think I need separate books on chess combinations or just study classics and find them there ? 

There is another new book in the market now - "A Modern Guide to Checkmating Patterns" by Vladimir Barsky. That seems very similar to the "Fundamental Checkmates" book - both have relatively more theory (detailed examples) and then problems in the end.

Comparatively, 1000 checkmate combinations by Henkin shows only 1 detailed example per chapter and then has lots of problems to solve.

Have you checked out the "A Modern Guide to Checkmating Patterns" book? I saw some reviews on youtube about it. It seems similar to FC book. 

You put really good book suggestions on your blog, so it would be great if you could give your opinion on these combination/checkmate theory books.

I have personally liked books that illustrate a pattern with more game examples and shows 8-10 moves around the pattern. For example, the chapter on bishop sacrifice in Seirawan's Winning chess combinations is really good. It doesn't just show the final mate, but the whole attack sequence and lines before that. (obviously not all mates are so complex)