[en] The inclusive invariant cross sections of sup(3,4,6)He and sup(6,7)Li isotope production at transverse momenta Psub(perpendicular) from 0.2 to 1.5 GeV/c under the laboratory angle of 90 deg in the collisions of 6.6 GeV protons with C, Cu, sup(112, 124)Sn and Au nuclei were measured. The numerical dependences of the cross sections on Psub(perpendicular) for all fragments and targets are tabulated. Measurements were carried out at the JINR high energy laboratory synchrophasotron. Protons accelerated up to 6.6 GeV energy bombarded thin inner targets of 1-13 mm thickness which were introduced into a beam synchronously with the accelerator cycle. Reaction products were detected with telescopes of ΔE, E detectors consisting of Si(p) type silicon detectors of 20-3500 μm, thickness and located at 1.5 m from a target at 90 deg angle to the proton beam direction. Reaction products were identified from their mass and charge by means of a common digital computer. Error for relative separation of helium and lithium isotopes is estimated as 1-3% for sup(3, 4)He isotopes and slightly higher for ⁶He and sup(6, 7)Li isotopes. Total area in determining absolute cross sections does not exceed 10% for carbon nuclei, 15% in experiments with copper and gold and reahes 20% when operating with targets of separated stannum isotopes