So, it seems, the scientific uncertainty generated by not having good data from the mid-20th century is going to be repeated in the early 21st century (satellites may help on opticaldepth, but it would really help to know what is being emitted).
Further optimizing the quality, images are scanned at up to 600 optical dpi for resulting scans that have a crisp and clear 3800x7200 24-bit color depth resolution.