Sanada Maru Original Soundtrack III
NHK大河ドラマ「真田丸」オリジナル・サウンドトラック III
NHK Taiga Drama "Sanada Maru" Original Soundtrack III

VGMdb (http://vgmdb.net/album/61932)

Sanada Maru Music Complete Collection
NHK大河ドラマ 真田丸 音楽全集 [初回生産限定]
Sanada Maru Ongaku Zen Shu

VGMdb (http://vgmdb.net/album/63690)
This one is said to contain previously unreleased tracks.



For completion's sake, here are the others that have already been posted:
Soundtrack I (Thread 200614), another rip (Thread 200920)
Soundtrack II (Thread 208398)
Soundtrack The Best (Thread 219532)

May I have the link please? Thank you.