A low-quality volume 101 PDF might be 15–25 MB. A “better” 300 DPI, full-color, searchable PDF for a single volume will typically range from 180 MB to 450 MB (depending on compression). For all 30 volumes, you are looking at 5–12 GB minimum.
If digital copies cannot be found, a "better" version can be created. private+magazine+pdf+volume+101+130+better