Comparing fields

Thank you, guys. Great job!
Dr. Bob asked us to use 050 _4 for every assignments.
2nd indicator, 4,shows the call number is not LCC.
I will confirm about DDC cutter number with Dr. Bob. I
remember that Dr. Bob gave us a link or software to find out the cutter number.
And I used it in 248.
245 12 is right if we want to keep an article.
245 subfiled c includes copyright sign, because the verso states copyright year is 2005.
650_0 is LCC subject heading which Dr. Bob requested.
We can add a subject heading. But, always, the first subject heading is an important main heading and reflects its LCC. Also, I was taught we don't need broader term.
For 300 field, I will confirm it with my co worker or supervisor.

I think the record looks great!