We have compiled a list of secondary photometric standards for 88 northern dwarf nova fields. An average of 6 stars per field were calibrated through broadband BVR filters. The secondary standards range in brightness from V ~ 11 to V ~ 17, have a B-V color range of ~0.1 to ~2.2 and lie within ~3' of the dwarf nova. Typical 1-alpha errors are ± ~0.05 mag.
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K. A. Misselt (1996) studied this question.