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The microwave spectra of two monosubstituted $\mathrm{<mrow\; data-mjx-texclass="ORD">13</mrow>}C$ species of bicyclobutane have been analyzed with the following results: for birdgchead $\mathrm{<mrow\; data-mjx-texclass="ORD">13</mrow>}C,A=16,934.17B=9,298.37C=8,316.53$; for apical $\mathrm{<mrow\; data-mjx-texclass="ORD">13</mrow>}C,A=17,256.84B=9.084.62C=8,220.44$, all values in MHz. Combining these results with those reported $earlier1$ it has been possible to obtain the $ra$ structure of the bicyclic ring. This gives $rCC$ (bridgehead) $=1.496\pm 0.003\backslash AA$. $rcc(ring)=1.497\pm 0.003\backslash AA$. Results obtained from the studies of deuterated species will also be presented and discussed.