Heat capacities of 1D and 2D pressure polymerized C-60 as well as the thermally depolymerized C-60 have been measured at temperatures between 4 and 350 K and the results analyzed for the lattice vibrations and the thermodynamic stability. It was found from the low-temperature heat capacity (T < 100 K) that on polymerization (1) the lattice vibrations, both translational and rotational, stiffen substantially, (2) an anisotropic nature emerges in response to the lower dimensionality, and (3) an anharmonicity still remains as in pristine C-60. The normal C-60 has an excess entropy of 67.8 and 99.4 J K-1 mol(-1) at 300 K relative to the 1D and 2D polymerized C-60, respectively. The thermodynamic stability is considered with two possible phase diagrams.