If you need to view the music for research or study before buying:
When looking for a "better" PDF, you are likely looking for a version that solves these specific issues.
Here’s a step-by-step guide to help you access and study Heino Tamberg’s Trumpet Concerto (2009) using PDF resources, while emphasizing legal and ethical practices:
Don't just print it. Open it in or forScore (for iPad).
For a "solid guide" on how to approach this work, refer to academic and pedagogical analyses: