Is there something comparable to the spruance bread flour?

Yes, there are several bread flours that can be compared to Spruance bread flour. Look for high-protein flours, such as King Arthur Bread Flour or Bob's Red Mill Artisan Bread Flour, which offer similar strong gluten development for making artisan breads. Additionally, any bread flour labeled as "high-gluten" or with a protein content of around 12-14% can serve as a suitable substitute. Always check the specific characteristics to ensure it meets your baking needs.