You can find physical copies at academic bookstores, particularly in hubs like Urdu Bazar, Lahore .
: The search results also point to a book titled simply "Mathematical techniques" by Dr. Karamat H. Dar. This text appears to be a standard textbook for B.A. and B.Sc. students, published in Pakistan. Finding a free PDF of Dr. Dar's book is more difficult as it seems to be out of print and not widely available on digital libraries, but the library catalog entries confirm its existence as a physical book in several libraries.
Vector calculus is fundamental to both advanced mathematics and theoretical physics (such as fluid mechanics and electromagnetism). Dr. Karamat covers: Dot and cross products in curvilinear coordinates. Gradient, Divergence, and Curl operations.
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