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![Cover for J C (John Cunningham) 18 McLennan · The Metric System of Weights and Measures [microform] (Paperback Book) (2021)](https://imusic.b-cdn.net/images/item/original/216/9781015323216.jpg?j-c-john-cunningham-18-mclennan-2021-the-metric-system-of-weights-and-measures-microform-paperback-book&class=scaled&v=1652312812)
![Cover for J C (John Cunningham) 18 McLennan · Electric Screening in Vacuum Tubes [microform] (Paperback Book) (2021)](https://imusic.b-cdn.net/images/item/original/631/9781015357631.jpg?j-c-john-cunningham-18-mclennan-2021-electric-screening-in-vacuum-tubes-microform-paperback-book&class=scaled&v=1652362620)
![Cover for J C (John Cunningham) 18 McLennan · Report on Some Sources of Helium in the British Empire [microform] (Paperback Book) (2021)](https://imusic.b-cdn.net/images/item/original/202/9781014808202.jpg?j-c-john-cunningham-18-mclennan-2021-report-on-some-sources-of-helium-in-the-british-empire-microform-paperback-book&class=scaled&v=1674325830)