These are some books that I have found useful in the past.

In addition to these, there are some books that I have picked up from eBay that are no longer in print. 

Metallurgy.  E L Rhead,  Longmans ( Publishers ) 1939.

Metallurgy for Engineers.  E C Rolason, Arnold ( Publishers ) 1939.

A Manual of Foundry Practice. J Lang & R T Rolfe, Chapman and Hall ( Publishers ) 1948.

Books available from Amazon