Best Macro level REI Book? Trends, Cycles, Markets, etc...

[Nicholas Lohr]

Wondering if anyone has any recommendations for books for learning about real estate investing trends at the macro level?  Things like figuring out where markets are in their cycles, what to look for in a specific market to qualify the whole market as being an attractive investment area, and what to look for as warning signs a market may be in decline.  It seems like most books focus on the specifics of the properties themselves. 

Also any recommendations for Real Estate magazines or publications that speak to this would be helpful as well.

Thanks! 

[Gordon Cuffe]

sorry here is his site 

http://www.realestatetiming.com/