The 'long range' superficial measurement reckoner for calculating areas in metric measureRobert Morton Gall Inglis · First published 1975Open the Tome
The ' Express' (decimal currency) 'on and off cost' percentage reckoner, 1 1/4% to 95% ..Robert Morton Gall Inglis · First published 1970Open the Tome
The ' Express' dollars exchange reckoner (decimal currency) for American and Canadian dollars giving rates from 1.99 7/8 to 2.70 1/4Robert Morton Gall Inglis · First published 1970Open the Tome
The ' Ideal' cents per 100 and decimal percentage reckonerRobert Morton Gall Inglis · First published 1967Open the Tome
The 'Express' universal decimal coinage reckonerRobert Morton Gall Inglis · First published 1964Open the Tome
