The First, Second and Third Primers of Islam, by Afzalur Rahman.
Three slim books for young children, on the basics of Islam.

Prayer: It's significance and benefits, by Afzalur Rahman.
This was originally published in 1974 as 'Utility of Prayer'. This updated and revised edition was published by the MST in 1979. "Prayer is the key which opens the gate of the kingdom of God. Creative prayer becomes a dialogue between man and God, and provides an opportunity to the earthly creature to open up his heart before his Creator."
ISBN: 978-0-907052-00-5

The Essentials of Islam, Vol. I, Faith and Worship, by Afzalur Rahman.
Published in 1980 by Kazi Publications in Pakistan.

This 4 Volume series on the economic system in Islam, by Afzalur Rahman, was published in Pakistan between 1974 and 1982 by Islamic Publications Ltd. The 4th Volume was published in the UK in 1979 by the MST as 'Banking and Insurance'.

These 3 books by Afzalur Rahman were published by the MST in 1979 and 1980. Covering aspects of the life of the Messenger of Allah (saw), they were later amalgamated in to the Encyclopaedia of Seerah.

The Qur'anic Sciences, by Afzalur Rahman, was published by the MST in 1981. "This book is an attempt to introduce Muslim youth and mankind in general to the wealth of knowledge that sprang from the teaching of the Qur'an... that led to scientific inventions and growth of knowledge in the Muslim world and brought about the Renaissance in Europe."
PB/SC ISBN: 978-0-907052-12-8
HB/HC ISBN: 978-0-907052-13-5

Registered as a book in 1986, Sufyism, sometimes listed as 'Sufyism: Form and Scope', was never published, for unknown reasons. A full manuscript exists, and it's release is under consideration.