Roman Emperor Bronze Question

Hi All!
In addition to collecting Russian Imperial coins, I also have a smallish 25 coin collection of Roman Imperial material. I was thinking that I would like to start a collection of coins with one bronze follis of each emperor. I have had a hard time finding a guide book to use as a reference for identification and completeness of the collection. Any suggestions?
Nick
In addition to collecting Russian Imperial coins, I also have a smallish 25 coin collection of Roman Imperial material. I was thinking that I would like to start a collection of coins with one bronze follis of each emperor. I have had a hard time finding a guide book to use as a reference for identification and completeness of the collection. Any suggestions?
Nick
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Comments
DPOTD
There is Wildwinds.com for attribution, too.
One nice thing about Roman Imperial coin collecting is that there is a wealth of information available for free online.
The Sear reference Harasha mentioned is fine- I have an outdated copy of it myself, but find I can practically get by without actually buying any books. Of course it's nice to also have the actual books on one's shelf.