A to E digit-encyclopedia-technica_vol-i-dec-2012
F to J digit-encyclopedia-technica_vol-ii-june-2013
K to O digit-encyclopedia-technica_vol-iii-december-2013
P to T digit-encyclopedia-technica_vol-iv-june-2014
U to Z digit-encyclopedia-technica_vol-v-u-to-z-december-2014