Reddit reviews The Roman Imperial Coinage Vol. VIII: The Family of Constantine I (v. 8)
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RIC has been out for a long time, is very detailed, but expensive. RIC VIII is the family of Constantine, so would cover the time period of Constans. Sear's millennium series is somewhat less detailed (I have at least a couple of coins which are in RIC but not in Sear), is a bit less expensive per volume (and fewer volumes), but Constans isn't covered until volume V which isn't quite out yet. It should ship this month, though.