If you just gotta have one, they're available on ABE books for upwards from 
$40 +shipping from China:
https://www.abebooks.com/servlet/SearchResults?an=zhong%20hua%20ren%20min%20gong&tn=standard%20electronic%20codebook&cm_sp=mbc-_-ats-_-all

    On Wednesday, June 29, 2022, 09:28:33 AM CDT, mark janzer via BVARC 
<[email protected]> wrote:  
 
  Sounds like the Standard Chinese telegraph code. The regular Chinese code 
book had 4 characters but the standard had three, so as to cut the cost 
(charged by # of characters) of sending a telegraph msg.
73MarkK5MGJ
    On Wednesday, June 29, 2022, 08:38:10 AM CDT, KK5QQ via BVARC 
<[email protected]> wrote:  
 
 Anybody have info about this?
ca 1980 in radio room of a boat on Yangtze River I saw book with 26 pg of 26 
columns & 26 rows — all lettered A to Z.  Each square had Chinese symbol for, 
say, “The temperature is …” Thus a 3-character code could send or inquire about 
17,576 items.
73 de Irv KK5QQ 


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