Best Discus Genetics Book?

[mistakes r crucial]

Hi,

Any advice appreciated on the best book out there on Discus strains/genetics.
MAC

[Merrilyn]

MAC I find the Discus Catalogue very good. It's a loose leaf edition and has room for adding new strains as they appear.

None of the breeding farms are giving away all their secrets, but this one will explain the strains used and how many times you need to cross back into the lines to produce new strains.

Not your 'run of the mill' discus book, but very useful for dedicated breeders.