Maybe Kanz ul Huda is part of a broader Islamic educational series. I think it's associated with the Iqra Education & Publishing House, which is responsible for many Islamic books, especially in the Sufi tradition. But I'm not 100% certain. Let me check that. A quick search would help, but since I can't access the internet, I have to rely on my memory. Yes, Iqra publishes a series called Iqra and another called Iqra 2. The Kanz ul Huda is probably part of the Iqra series. It includes books like "Imaan" for primary grades, "Ajaib-e-Mubin" for higher grades, etc. Kanz ul Huda might be a subset or another collection under their publishing. But I'm not entirely sure how many books there are or the exact titles.

, the organization offers various e-books and booklets in PDF format, many of which are available for free to support personal development and communal service. Kanz ul Huda Popular Titles and PDF Resources Kanz ul Huda Digital Archive includes a variety of guides and litanies:

Here are a few details about Kanz ul Huda:

Another angle: sometimes, Islamic seminaries or educational institutions provide free access to religious texts. There might be websites that host PDFs under a Creative Commons license or with permission from the publisher. The user might not know about these resources. For example, sites like Muslim.org, Islam.org, or other Sufi-specific websites might have some books available. Also, Google Books or Google Scholar could have previews or excerpts.

Simply possessing a will not transform your spiritual state. The author wrote these books as a manual for practice, not just reading.