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. We report elastic (rotationally summed) and rotationally resolved cross-sections for scattering of low-energy electrons by the C3H4 isomers allene, propyne, and cyclopropene, which belong to the D2d, C3v, and C2v groups, respectively. We employed the Schwinger multichannel method with pseudopotentials at the static-exchange approximation, combined with the adiabatic-nuclei-rotation (ANR) approximation...