Facing the city and starting on the right side and working my way around I found tablets at the following locations:
( -66, 27, -1197 ) /waypoint -66, 27, -1197
( 132, 19, -1285 ) /waypoint 132, 19, -1285
( 193, 20, -1291 ) /waypoint 193, 20, -1291
( 274, 19, -1419 ) /waypoint 274, 19, -1419 far end
also 388, 18, -1490 other side of wall at far end
also 581, 31, 1560 - way back
I also picked up a couple from this list below but didn't mark the location
( -77, 31, -1069 ) /waypoint -77, 31, -1069
( 74, 22, -1159 ) /waypoint 74, 22, -1159
( 152, 23, -1163 ) /waypoint 152, 23, -1163
( 341, 18, -1501 ) /waypoint 341, 18, -1501

