diff --git a/htrc/auth.py b/htrc/auth.py
index b975e63..7d4a9df 100644
--- a/htrc/auth.py
+++ b/htrc/auth.py
@@ -4,6 +4,7 @@
 #import ssl
 #import time
 import subprocess
+
 import requests
 import requests.auth
 #import configparser
@@ -43,6 +44,7 @@ def get_jwt_token():
     else:
         raise RuntimeError("JWT token retrieval failed: {}".format(data['error']))
 
+
 def credential_prompt():
     """
     A prompt for entering HathiTrust Research Center credentials.
diff --git a/htrc/config.py b/htrc/config.py
index fa2815a..e48c3cf 100644
--- a/htrc/config.py
+++ b/htrc/config.py
@@ -111,6 +111,7 @@ def get_jwt_token(path=None):
     return token
 
 def save_jwt_token(token, path=None):
+
     """
     Saves JWT token in the config file.
     """
diff --git a/htrc/volumes/__init__.py b/htrc/volumes/__init__.py
index aabb171..6fa2145 100644
--- a/htrc/volumes/__init__.py
+++ b/htrc/volumes/__init__.py
@@ -13,15 +13,16 @@
 
 standard_library.install_aliases()
 
+
 #from builtins import input
 from htrc.models import HtrcPage
 
 import http.client
 from io import BytesIO, TextIOWrapper
 import json
-import logging
 import os.path
 import progressbar
+
 #import re
 import socket
 import ssl
@@ -37,7 +38,6 @@
 from htrc.runningheaders import parse_page_structure
 from functools import partial
 import pandas as pd
-
 #from htrc.lib.cli import bool_prompt
 from htrc.util import split_items
 import htrc.config
@@ -74,6 +74,7 @@ def get_volumes(data_api_config: htrc.config.HtrcDataApiConfig, volume_ids, conc
     data = {'volumeIDs': '|'.join(
         [id.replace('+', ':').replace('=', '/') for id in volume_ids])}
 
+
     if concat:
         data['concat'] = 'true'
 
@@ -210,6 +211,7 @@ def get_pages(data_api_config: htrc.config.HtrcDataApiConfig, page_ids, concat=F
 
     return data
 
+
 #def get_oauth2_token(username, password):
     # make sure to set the request content-type as application/x-www-form-urlencoded
     #headers = {"Content-type": "application/x-www-form-urlencoded"}
@@ -242,6 +244,7 @@ def get_pages(data_api_config: htrc.config.HtrcDataApiConfig, page_ids, concat=F
         #token = jsonData["access_token"]
         #logging.info("*** parsed token: {}".format(token))
 
+
     #else:
         #logging.debug("Unable to get token")
         #logging.debug("Response Code: {}".format(response.status))
@@ -252,9 +255,11 @@ def get_pages(data_api_config: htrc.config.HtrcDataApiConfig, page_ids, concat=F
     #if httpsConnection is not None:
         #httpsConnection.close()
 
+
     #return token
 
 
+
 def grep_error(file_name, output_dir, pattern, txt_index):
     na_volume = []
     if output_dir.endswith("/"):
@@ -270,6 +275,9 @@ def grep_error(file_name, output_dir, pattern, txt_index):
     return na_volume
 
 
+    return na_volume
+
+
 def _to_htrc_page(page_file, zip):
     with TextIOWrapper(BytesIO(zip.read(page_file)), encoding='utf-8') as page:
         return HtrcPage([line.rstrip() for line in page.readlines()])
@@ -427,6 +435,8 @@ def _remove_headers_footers_and_save(vol_data, concat, hf_min_similarity, hf_win
                 with open(os.path.join(output_dir, vol_page_path), 'w', encoding='utf-8') as page_file:
                     page_file.write(page_body)
 
+
+
         removed_hf = []
         for vol_page_path, vol_page in zip(sorted_vol_zip_page_paths, vol_pages):
             if not (vol_page.has_header or vol_page.has_footer):
diff --git a/setup.py b/setup.py
index 9fa5ac0..215fae3 100644
--- a/setup.py
+++ b/setup.py
@@ -9,8 +9,10 @@
 import atexit
 import tarfile
 
+
 __version__ = '0.1.57'
 
+
 install_requires = ['PyLD', 'future', 'prov', 'unicodecsv', 'progressbar2', 'pandas',
                     'requests', 'argparse==1.1', 'topicexplorer==1.0b226', 'numpy==1.16.2', 'tqdm==4.46.0']
 # TODO: migrate to docs confix:, 'sphinx-argparse', 'sphinxcontrib-fulltoc']