@wesm unfortunately I can't release the original dataset, though I can give you 
the scheme:
```python
>>> dataframe.dtypes
A    datetime64[ns]
B            object
C            object
D            object
E            object
F            object
G            object
H            object
dtype: object
>>> dataframe.shape
(55049840, 8)
>>> pprint([type(c) for c in dataframe.loc[0]])
[<class 'pandas._libs.tslibs.timestamps.Timestamp'>,
 <class 'str'>,
 <class 'str'>,
 <class 'str'>,
 <class 'str'>,
 <class 'str'>,
 <class 'str'>,
 <class 'str'>]
```


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