  A workshop was held at Fermilab on March 20-21, 2013 to discuss the
development of liquid argon time projection chambers (LArTPC) in the United
States. The workshop was organized under the auspices of the Coordinating Panel
for Advanced Detectors, a body that was initiated by the American Physical
Society Division of Particles and Fields. All presentations at the workshop
were made in plenary sessions organized into seven topical categories: $i)$
Argon Purity, $ii)$ Cryogenics, $iii)$ TPC and High Voltage, $iv)$ Electronics,
Data Acquisition and Triggering, $v)$ Scintillation Light Detection, $vi)$
Calibration and Test Beams, and $vii)$ Software. This document summarizes the
current efforts in each of these topical categories. It also highlights areas
in LArTPC research and development that are common between neutrino experiments
and dark matter experiments.
