I would like to know if I'm not mistaken:
When having a series of の-adjectives, it is ok to perform an ellipsis of the の particles and create a long kanji compound.
For example: 日本語基本文法辞典, or a sign on a building: 日本美術館。
As far as I know, this should have been: 日本語の基本の文法の辞典 and 日本の美術館。
Thank you.