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We report CCD time-resolved photometric observations of three objects selected from a study of cataclysmic variable candidates in the Palomar-Green survey of high-galactic-latitude ultraviolet excess objects. We indentify PG~0911$-$066 as a likely dwarf nova, possibly of the WZ~Sge sub-type and find a large-amplitude, short-period photometric periodicity, possibly orbital in nature, of 82.931$\pm$0.001~min. We find a superhump period of 0.0656$\pm$0.0001~d for a new SU~UMa dwarf nova, PG~0943$+$521 and identify unusual behavior which may be indicative of a link between the SU~UMa class of dwarf novae and short-period permanent superhump systes. Our study of PG~1633$+$115 reveals long-term variability as well as a photometric periodicity of $\sim$3.5 hr; an aliasing problem prevents the identification of a unique period. Finally, we briefly examine the impact of the present study on the fraction of eclipsing systems in the magnitude limited sample.
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