INFO:
Disclaimer: The introduction to this special is missing, along with roughly half of the first episode in the marathon. The previous owner of the tape didn't record these sections, and I apologize. The end credits are also cut off.
大晦日だよ!ドラえもん TV&映画20周年!! まるまる3時間超スペシャル : Fujiko F. Fujio, Shin-Ei : Free Download, Borrow, and Streaming : Internet Archive