  In this paper, we describe how to use the Maximum Reduced Proper Motion
method (Phan-Bao et al. 2003) to detect 57 nearby L and late-M dwarfs (d_phot
<= 30 pc): 36 of them are newly discovered. Spectroscopic observations of 43 of
the 57 ultracool dwarfs were previously reported in Martin et al. (2010). These
ultracool dwarfs were identified by color criteria in ~5,000 square degrees of
the DENIS database and then further selected by the method for spectroscopic
follow-up to determine their spectral types and spectroscopic distances. We
also report here our newly measured proper motions of these ultracool dwarfs
from multi-epoch images found in public archives (ALADIN, DSS, 2MASS, DENIS),
with at least three distinct epochs and time baselines of 2 to 46 years.
