We report on distance determinations for two high Galactic latitude cloud complexes , G192-67 and MBM 23-24 .
No distance determination exists in the literature for either cloud .
Thirty-four early type stars were observed towards the two clouds , more than half of which have parallaxes measured by the Hipparcos satellite .
For the remaining stars we have made spectroscopic distance estimates .
The data consist of high resolution echelle spectra centered on the \ion Na1 D lines , and were obtained over six nights at the Coudé Feed telescope at Kitt Peak National Observatory .
Interstellar absorption lines were detected towards some of the stars , enabling estimates of the distances to the clouds of 109 \pm 14 pc for G192-67 , and of 139 \pm 33 pc for MBM 23-24 .
We discuss the relationship of these clouds to other ISM features such as the Local Hot Bubble and the local cavity in neutral hydrogen .