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Artículo de publicación ISIWe publish 622 CCD photometric sequences in the Johnson-Kron-Cousins standard system, distributedboth in the northern and southern hemispheres, useful for the calibration of photographic photometry of Schmidtsurvey plates. The collection and reduction of the CCD data presented here are part of a long-term programdevoted to the construction of the Second Guide Star Photometric Catalog (GSPC-II). The GSPC-II is an all-skycatalog of photometric stellar sequences with a limiting magnitude of V = 19 or fainter, in the (B), V , andR passbands of the Johnson-Kron-Cousins system. Standard photometric errors are at the level of  0.07 for aV   19 magnitude star. These sequences are being used by teams of the Space Telescope Science Institute (STScI)and the Osservatorio Astronomico of Torino (OATo) for the photometric calibration of the Second Guide StarCatalog

An all-sky set of $\vec (B)-V-R$ photometric calibrators for Schmidt surveys