Hello,
I am a keen amateur historian and like to view Korean National Treasures. There are a few that I am struggling to see. Could you tell me how I can view the following -

Family register of Yi Seong-gye- National Treasure 131
Jingbirok- National Treasure 132
Certificate of meritorious subject for Yi Hwa - National Treasure 232
Porcelain Jar, National Treasure 310 (wasn’t on display when I visited the National Palace Museum)

I realise that some my never be on display due to preservation but could you let me know I if they will be on display in the next year or so?

Thank you for your time
Robert Cousins