Vintage National Radio Institute Pioneer Course Radio Booklets Lot of 9 1950s For Sale

Vintage National Radio Institute Pioneer Home Study Radio School Course Radio Booklets Lot of 9 - 1940s 1950s
Good condition, signs of age and use. Page toning, minor spotting present. Some markings/writing may be present, but I did not locate any. Book 48RH-1 has minor water spotting in bottom right corners and dictionary IX-2 has moderate water staining in the bottom right corners neither of which affect readability.
Lot Includes 8 Booklets:*Radio-Television-Electronic Dictionary IX-2*Radio-Television-Electronic Dictionary IX-3*Servicing, Checking And Equalizing Audio Amplifiers 48RH-1*Radio Frequency Amplifiers For Sound And Television Communication 16FR-1*Getting Acquainted With Receiver Servicing Smaple Lesson - Study Schedule No. 4*How Iron-Core Coils And Transformers Operate In Radio Circuits 11FR-2*Radio Formulas And How To Use Them 39X*How R.F. Amplifiers Work In AM, FM And TV Receivers 16FR-2*How To Use Schematic Diagrams 32B